A rich old man has transformed his mansion into a twisted and deadly fun house. His goal: to make a sport of slaughtering Japan's criminal population! Can Kuroko Koumori, psychotic murderer-turned-hired gun for the police, manage to escape? Or will she be taken out by the most perilous of foes--a personal maid with a penchant for dismemberment?

As a former mass murderer, Kuroko Koumori knows a thing or two about how killers think. A string of deaths points straight to an ex-con-turned-business mogul who used to skin the faces off his victims. But could it be a red herring? As chaos unfolds at the local amusement park, it might just be Kuroko's partner, Hinako, who's closest to the truth!

The identity of Comedy Writer continues to confound the police, but Kuroko believes she's got her man! After thwarting his "performance," she corners him to deliver an ultimatum! Could this aggressive approach be a bridge too far? Meanwhile, another suspicious individual is out and about, and Hinako's not going to let him get away! But there's no telling what he'll do to keep his secret hidden from prying eyes...

Mass murderers may not have much by way of careeer skills, but Kuroko Koumori seems to have landed her dream job as a hitwoman for the Tokyo police! A license to kill other killers? That's some serious job satisfaction, right there!

Higaki, of the Sakura Pruning Group, was forged in the fires of war and fueled by a passion for revolution. Now an old man, he's engaged in a life-and-death battle with Kuroko in order to achieve his ultimate goal. But is Higaki animated by a desire to conquer Japan or by something more personal? The secrets of the Sakura Pruning Group reach far and wide-even right into Hinako's past!

Kuroko’s group goes to a hot spring deep in the mountains, where all the land is owned by the wealthy Yamatsukami family. But right as the family is deciding the next heir, the third son is found murdered, and with the only bridge in and out of the area destroyed, the list of suspects is small. Cut off from the rest of the world, the family begins to whisper about a mysterious “Ayako,” and before long, another victim turns up... With no end to the grisly murders in sight, how will Kuroko solve this closed-room case?

The Perfumer and her group reach the mountain of the Yamatsukami family, where the clue behind “Tozakura” sleeps. Hinako and Ayako split up from Kuroko and the others, following the women who had gone ahead, but they can’t hide from the Perfumer, who easily spots them with her abilities. To allow Hinako to escape, Ayako decides to face them on her own, but she’s soon cornered and poisoned by the Perfumer. All seems lost—until Kuroko and the others arrive, and the real fight begins...